tmio_mmc.c

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/*
 * linux/drivers/mmc/host/tmio_mmc.c
 *
 * Copyright (C) 2007 Ian Molton
 * Copyright (C) 2004 Ian Molton
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Driver for the MMC / SD / SDIO cell found in:
 *
 * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
 */

#include <linux/device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/scatterlist.h>

#include "tmio_mmc.h"

#ifdef CONFIG_PM
static int tmio_mmc_suspend(struct platform_device *dev, pm_message_t state)
{
    const struct mfd_cell *cell = mfd_get_cell(dev);
    int ret;

    ret = tmio_mmc_host_suspend(&dev->dev);

    /* Tell MFD core it can disable us now.*/
    if (!ret && cell->disable)
        cell->disable(dev);

    return ret;
}

static int tmio_mmc_resume(struct platform_device *dev)
{
    const struct mfd_cell *cell = mfd_get_cell(dev);
    int ret = 0;

    /* Tell the MFD core we are ready to be enabled */
    if (cell->resume)
        ret = cell->resume(dev);

    if (!ret)
        ret = tmio_mmc_host_resume(&dev->dev);

    return ret;
}
#else
#define tmio_mmc_suspend NULL
#define tmio_mmc_resume NULL
#endif

static int __devinit tmio_mmc_probe(struct platform_device *pdev)
{
    const struct mfd_cell *cell = mfd_get_cell(pdev);
    struct tmio_mmc_data *pdata;
    struct tmio_mmc_host *host;
    int ret = -EINVAL, irq;

    if (pdev->num_resources != 2)
        goto out;

    pdata = pdev->dev.platform_data;
    if (!pdata || !pdata->hclk)
        goto out;

    irq = platform_get_irq(pdev, 0);
    if (irq < 0) {
        ret = irq;
        goto out;
    }

    /* Tell the MFD core we are ready to be enabled */
    if (cell->enable) {
        ret = cell->enable(pdev);
        if (ret)
            goto out;
    }

    ret = tmio_mmc_host_probe(&host, pdev, pdata);
    if (ret)
        goto cell_disable;

    ret = request_irq(irq, tmio_mmc_irq, IRQF_TRIGGER_FALLING,
                dev_name(&pdev->dev), host);
    if (ret)
        goto host_remove;

    pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
        (unsigned long)host->ctl, irq);

    return 0;

host_remove:
    tmio_mmc_host_remove(host);
cell_disable:
    if (cell->disable)
        cell->disable(pdev);
out:
    return ret;
}

static int __devexit tmio_mmc_remove(struct platform_device *pdev)
{
    const struct mfd_cell *cell = mfd_get_cell(pdev);
    struct mmc_host *mmc = platform_get_drvdata(pdev);

    platform_set_drvdata(pdev, NULL);

    if (mmc) {
        struct tmio_mmc_host *host = mmc_priv(mmc);
        free_irq(platform_get_irq(pdev, 0), host);
        tmio_mmc_host_remove(host);
        if (cell->disable)
            cell->disable(pdev);
    }

    return 0;
}

/* ------------------- device registration ----------------------- */

static struct platform_driver tmio_mmc_driver = {
    .driver = {
        .name = "tmio-mmc",
        .owner = THIS_MODULE,
    },
    .probe = tmio_mmc_probe,
    .remove = __devexit_p(tmio_mmc_remove),
    .suspend = tmio_mmc_suspend,
    .resume = tmio_mmc_resume,
};

module_platform_driver(tmio_mmc_driver);

MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
MODULE_AUTHOR("Ian Molton <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tmio-mmc");